Using the absolute volume method, a colleague started a mix design for a simple concrete foundation...

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Civil Engineering

Using the absolute volume method, a colleague started a mixdesign for a simple concrete foundation in a mild climate and gotthrough Step 5 and has asked you to finish the work. They havealready determined the mix needs:
â€¢ a w/c ratio of 0.45
â€¢ a 2â€ slump
â€¢ 1830 lb of gravel in the oven dry conditions,
â€¢ and 3.5% air provided by air entrainer.
The available gravel (coarse aggregate) is subangular with a NMSA =3â„4â€. It has a specific gravity, Gs = 2.7, with a moisture contentof 1.8% and an Absorption of 2.2%. The available sand (fineaggregate) has a specific gravity, Gs =2.45, with a moisturecontent of 3.8% and an absorption of 2.4%. Gs of cement = 3.15.
For each cubic yard of concrete for this mix, determine:
â€¢ the total weight of water, cement, moist sand, and moist gravelrequired. Donâ€™t worry about the amount of
air entrainer product in fluid ounces.
â€¢ Summarize the total mix design (neglecting the required fluidounces of air entrainer)
Course aggregate:
Fine aggregate:
Cement:
Water:

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4.2 Ratings (546 Votes)

Ans Let the total volume of trial mix be 1 cubic yard 27then according to ACI 211191 table 633 for34 in aggregate and 2 in slump amount of water required percubic yard of concrete is 280 lbcy Water requied 280 lbcyAlso Amount of cement Amount of water wc ratio Amount of cement required See Answer

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